66689087 has 8 divisors (see below), whose sum is σ = 68766720. Its totient is φ = 64635480.

The previous prime is 66689081. The next prime is 66689111. The reversal of 66689087 is 78098666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66689087 - 2⁴ = 66689071 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66689081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287 + ... + 11552.

It is an arithmetic number, because the mean of its divisors is an integer number (8595840).

Almost surely, 2^66689087 is an apocalyptic number.

66689087 is a deficient number, since it is larger than the sum of its proper divisors (2077633).

66689087 is a wasteful number, since it uses less digits than its factorization.

66689087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12013.

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 66689087 is about 8166.3386532766. The cubic root of 66689087 is about 405.5255829423.

The spelling of 66689087 in words is "sixty-six million, six hundred eighty-nine thousand, eighty-seven".